Error Message:
1. error: no such device :
    Entering rescue Mode...
    grub rescue>_
2. Error : Unknown filesystem
    grub rescue>

People face this problem for different reasons:
1. Just installed Linux with Windows in dual boot mode and after rebooting you can face this problem.
2. You was using linux and windows dual but but because of some reason you deleted your Linux partition directly from disk management then you can face this problem.
There are really many reason for this problem.
This is call as Master Boot Record (MBR) has missed. We will not discuss too much lets start the process.
What we need to Fix this - Windows 7/8 OS Disk.
1. Insert Your Windows 7 or Windows 8 OS Disk. (Here I am using Windows 7).
2. When asked to "Install a new copy" or "Repair" Select "Repair" option.
(Click image for large view)

3. Select your Local Disk and Click Next
4. Now, You will see a set of system recovery options. Select "Command Prompt".

5. In Command Prompt Type bootrec/fixmbr and Press Enter. Wait for a while you will receive a message 'The Operation Completed Successfully.' 

6. Again Type another Command bootrec/fixboot and Press Enter. Wait for a while you will receive a message 'The Operation Completed Successfully.' 

7. Now type exit for closing command prompt. 

8. Now, Shut Down or Restart your System and Eject the Windows OS Disk or If you are using Bootable USB then remove your USB. After Restarting You will see that your problem has been solved.
(Click image for large view)

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